thanks, Ethan and Ben. On Thu, Jun 7, 2012 at 7:29 PM, Ethan Jackson <[email protected]> wrote:
> > So upgrade to 1.7.0 (see from another post discussing on performance, > but it > > is related to kernel mode) should not help, right? > > Correct, performance improvements were targeted at kernel datapaths. > Some of those improvements may have impacted the userspace datapaths a > but, but I doubt they had a significant impact. > > > Also, I am curious that how the QoS work in ovs? Does QoS use traffic > > control (tc)? If so, tc requires kernel support, which is not doable in > > userspace mode of ovs. correct me if I am wrong here. > > Correct, it won't work. > > > Just wondering if improving the performance of user space datapath is on > > schedule or just something with low priority? > > As Ben said, very low priority for us. Patches welcome. > > Ethan > > > > > > > On Thu, Jun 7, 2012 at 6:38 PM, Ethan Jackson <[email protected]> wrote: > >> > >> > Thanks, Jesse. Could you explain more details on what features are not > >> > available in the user space datapath? > >> > >> The main feature being performance. That being the issue you're > >> running into, I would suggest switching. Certain kinds of port types > >> aren't supported as well. Tunneling and what not. > >> > >> Ethan > >> > >> > > >> > > >> > On Thu, Jun 7, 2012 at 6:05 AM, Jesse Gross <[email protected]> wrote: > >> >> > >> >> On Thu, Jun 7, 2012 at 12:52 PM, Dong Jin <[email protected]> > wrote: > >> >> > I am running userspace mode of ovs with the following topology > >> >> > > >> >> > VM1(eth0) ---- (eth0)VM2(eth1) --- (eth0)VM3 > >> >> > > >> >> > VM1 and VM3 are end hosts, and VM2 runs the userspace ovs daemon to > >> >> > emulate a two-port Ethernet switch. > >> >> > > >> >> > I sent UDP traffic from VM1 to VM3. Everything is received with 100 > >> >> > Mb/s rate. However, for 200 Mb/s data rate, packet losses are > >> >> > observed > >> >> > (below is the log), and throughput is around 150 Mb/s. If I connect > >> >> > VM1 and VM3 directly without using VM2, it is fine to receive 200 > >> >> > Mb/s > >> >> > or even high rate with no loss. It looks that ovs causes the packet > >> >> > drop and limit the throughput. Just wondering the reason and how to > >> >> > overcome this to emulate high data rate? Advices are very > >> >> > appreciated. > >> >> > >> >> The userspace datapath is primarily intended for testing and maximum > >> >> compatibility. It does not have all of the features or performance > of > >> >> the kernel module. > >> > > >> > > >> > > >> > _______________________________________________ > >> > discuss mailing list > >> > [email protected] > >> > http://openvswitch.org/mailman/listinfo/discuss > >> > > > > > >
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